Simultaneous determination of cation exchange capacity and surface area of acid activated bentonite powders by methylene blue sorption

YENER N., Bicer C., ÖNAL M., Sarikaya Y.

APPLIED SURFACE SCIENCE, cilt.258, sa.7, ss.2534-2539, 2012 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 258 Sayı: 7
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1016/j.apsusc.2011.10.088
  • Dergi Adı: APPLIED SURFACE SCIENCE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.2534-2539
  • Anahtar Kelimeler: Methylene blue, Bentonite, Smectite, Acid activation, Cation exchange capacity, Surface area, PHYSICOCHEMICAL PROPERTIES, ADSORPTION, POROSITY, REMOVAL, CLAYS, DYE
  • Ankara Üniversitesi Adresli: Evet

Özet

To distinguish the ion exchanged and physically adsorbed methylene blue cations (MB+) on ionic surfaces, acid activated bentonite samples were used as porous adsorbents. A natural calcium bentonite (CaB) sample from Enez/Edirne, Turkey, was acid activated at 90 degrees C for 16 h with various HCl/CaB ratios. The irreversible exchange and physical adsorption of MB+ cations on the ionic solids have simultaneously occurred. The ion exchanged (m(ex)) and physically adsorbed (m(ad)) MB+ contents were obtained as the values of sorption capacity at c = 0 and the increase to a plateaus of adsorption isotherms, respectively. The m(ad) value was taken to be monolayer adsorption capacity. Cation exchange capacity (CEC) and specific surface area (S-MB) for each sample were calculated from the mex and m(ad) values, respectively. Also, the BET specific surface areas (S-BET) and pore size distribution were determined from low temperature nitrogen adsorption/desorption data. A linear correlation between the SMB and SBET values was found. (C) 2011 Elsevier B.V. All rights reserved.